Bates was the make of SD hat that everybody wanted in the sixties. They had the full crown that could be pulled down either side and with a bit of encouragement, a wet towel, could stay that shape. Mine ended up in the Borneo jungle after 1,000hrs jammed beside the gearbox of a Whirlwind.
Around the end of that decade apparently Bates got the nod from Airbox that they should only supply an orthodox version. They seemed to go out of fashion after that.